000 00273nam a2200121Ia 4500
082 _a005.71 HAL
100 _aHALSALL, FRED
245 _aDATA COMMUNICATION COMPUTER NETWORKS AND OPEN SYSTEMS
250 _a4
260 _bPEARSON
_c2004
300 _a907
942 _2ddc
_cB
999 _c58895
_d58895